Stapling machine



June 9, 1942. 2 -w. G. PANKONI STAPLING MACHINE Filed Sept. 2e, 1940 s sheets-sheet 1 INVEN'roR WML/Hm P/sW/faA//M v BY . ATTORNEY.

June v9, 1942. w, G, PANKOMN 2,286,155

STAPLING MACHINE Filed sept. 2s, 1940 5 sheets-sheet 3 JNVENTOR.

WIL L IHM C? PAM/fo/V/N.

I ATTORNEY';

Patented June 9, 1942 UN ETED STAT ES PSTENT OF F ISE STAPLING liACIIINE"` William G. Pankoniln: Chicago, Ill.

Application September 26, 1940, Serial N0. 358,439

(C'l. 1-49) l 15 Claims.

Another object ofthe invention is toprovideA a-V stapling machinel having opposed operating handles providinggforce multiplying mechanism and completely enclosing the other operative parts `of the stapling machines.

Anotherobject of the invention is-to provide a stapling machine having a simplified staple clinchinganvil adapted to clinch the-legs of 4thestaple under the body thereof; or to Vclinch one under theybody and one extending outwardly, or to bend both legs outwardly, thereby providing a permanent or temporary fastening,

Other-objects and advantages reside in certain novel features of the construction, arrangement, and'combination o'parts; which will be hereinafter moreV fully described and particularly pointed ontin the appended claims, reference beinghadtoV the accompanying drawings forming a partei-'this specification, and in which:

Figure lis a view in side elevation showing a stapling machinel embodying Vthe present invention;

Figure 2 isa sectional View in side elevation showing a stapling machine embodying the present invention' Figures 3 and'll are fragmentary plan viewsV taken from the Vline 3-3'of Figure 2 and showingv the stapleclinching anvil'ingtwo of its selective positions;

Figure 5 is an exploded, View in perspectiveV showing the various parts comprising the stapling machine embodying the present invention;.

Figure 6 is a sectional view in side elevation showing a stapling machine embodying the present invention with the parts positioned after the stapling operation is partially completed;

Figure 7 is a sectional View in side elevation showing a stapling machine embodying the present inventionV with the parts as positioned after the stapling operation has been completed;

Figure S isa view` in side elevation with parts shown in fragmentary section showing the stapling machine embodyingY thepresent invention with theparts positioned after the machine has been operated-to eXtrude the clogged staples; and Figure 9 is a fragmentary sectional view taken online 9--9 of Figure 8, showing the -manner in which thev spring` latch preventsrelative movemen-t of the clinching. anviland staple ejection chute: so that'clogged staplesmay be removed.

Referringnow to the drawings7V the stapling machine generallycornprises a body-member I which denesfalmagazine and ejection chute, a top casing handle-2`operable in the driving'of stapleslfromthemagazine and ejection chute, an anvil. supporting. lever 3;' and a lower casing handle 4. The stapling machineis designed to loe-constructed ofsh'eet metal partsstamped out orstruckupin dies to render the machine light infweig-ht and economical'to manufacture although the varofus partsmay be otherwiseA construc'rted.` Throughout. the, description the forwardend isdefined as thetleft end as viewed inthe figures, andvice versa.

The, body` member l comprises a housing formed of;elongated side. Walls .5 and afront Wall t.v At,v the lower-'.forward end of the side Walls 5 there are provided -inturnedsupporting portions l. Above the supporting portions, andv extending substantially for the length thereof, the side Walls 5.,-are provided with an-inwardly formed projecting ridge .8 Vwhich provides the upper guide for. staples in -.the` magazine. A channel-member llis` positioned'on and riveted or otherwise fastened totheinturned supports 'l so that vthe topv edges of the sides of the channel are `spaced below and parallel to the inwardly projecting ridges 8.- Th sides. of f the channel member 9 area-lso spaced inwardly from-the inner sides of the walls 5. The rear of the channel member is provided with integrally. formed laterally projectingv rivets IELprovided with shoulders and adapted to be'swedged or riveted in openings Il formed-intheside Walls 5.whereby the rear end of-thevchannel 9.is held in its proper-position below the inturned,pro'jecting ridges 8. The staples S ride inv-straddle fashion onthe top edges of thesidesfof channel 9. sides ofrchannel `9 are deeper than the main portionto providen the rear guide of the ejection chute,Y as indcatedat- G. By means of these guides G the bridge of the staple is supported t0 the very bottom of the forward front Wall 6, whichwall-provides-the forward guide for the ejectionchute.Y

A depressed portion l2 is provided in the bottonl of the channel member 9 centrally thereof. The-depressed portion i2 is also provided with slots |3 at-each1side thereof to accommodate The forward ends of thev the legs of a sliding link I4. To urge staples forwardly along the channel 9 there is provided a follower I5 slidable on a rod I8 about which is positioned a coil spring I1. The forward end of the follower rod is turned over to prevent the follower I5 from becoming disengaged from the rod I6. The rear end of the rod I6 is provided with a winged handle I8 secured thereto by peaning over the end of the rod I 6 and forcing the handle I8 rigidly against a small collar I9 formed on the rod. One of the wings of the handle I8 is provided with an H-shaped latch 20. The latch is adapted to engage with a notch 2I formed in one of thesides of the channel 9 at the rear thereof as the rod I6 is inserted its full extent and the handle I8 is turned clockwise. It will be understood that after the latch 28 is turned so it ts within notch 2l, the spring I1 forces the handle I8 rearwardly until the H-shaped portion of latch 29 slides into the rearwardly extending leg of the notch 2|. This prevents any further turning until the handle I8 is manually forced forwardly against the pressure in spring I1. When this is done the handle I8 may be turned counter-clockwise (as viewed from the right-hand side of the drawings) until latch 20 is entirely free of notch 2I whereupon the follower assembly may be entirely withdrawn.

In order to drive the staples from the magazine out through the ejection chute there is provided a reciprocating staple driving blade 22. The blade 22 is loosely supported at the forward end of a staple driving arm 23. The arm 23 is channel shape in cross section and fits within and is substantially coextensive of the side walls 5 of the body member I above the inwardly projecting ridges 8. The side walls 5 at the rearward end are provided with oppositely alined apertures 24. The outer ends of the sides of the driving arm 23 are also provided with alined apertures 25. A pin 26 passing through the apertures 24 and 25 pivotally maintains the staple driving arm 23 in proper position within the main body member- I'. Oscillation of the arm 23 causes reciprocal vertical movement of the blade 22 in the ejection chute; the blade 22 being guided by the guiding edges G, the forward ends of ridges 8 and front wall 6.

The side walls '5 are provided with upwardly projecting nodes 21 immediately adjacent the front wall 6. These nodes are provided with alined apertures 28. The top casing handle 2 is of inverted channel-shaped cross section and its side walls overlap the side walls 5 of the body member I. At its forward end the handle 2 has a raised section to accommodate a pin locking spring 29. The spring 29 is curved in clockwise fashion with one edge bearing against the top of the handle 2 and the other end movable within the limits of a slot 30 cut in the forward top face of the handle, the spring 29 being fulcrumed about a pivot 3I passing through apertures 32 in the forward end of the side walls of the handle 2. The spring 29 is provided with centrally located apertured flanges 33 through which the pin 3I passes. The movable end p0rtion of the spring 29 has a key portion 34 which fits in a circular groove 35 provided in fulcrum pin 36. The fulcrum pin 35 passes through oppositely alined apertures 31 provided in the forward end of the sides of the casing handle 2 and through the apertures 28 in the side arms 5, whereby the handle 2 is pivotally mounted on and is in overlapping enclosing relationship over the body member I. The sides of the staple the pvot 49.

driving arm 23 at the forward end thereof are cut away, as indicated at 38 to permit sufcient operating clearance between the arm 23 and the fulcrum pin 36 and spring 29.

A link 39 connects the staple driving arm 23 and the top casing handle 2. The link 39 has oppositely related upwardly extending legs, the outer ends of which are offset outwardly from the main portion thereof. The main portion of the legs fits between the sides of the staple driving arm 23 and is pivotally secured thereto by a pin 40 which passes through apertures formed in the legs of the link and sides of the arm. Il'he offset portion of the legs of the link 39 extend upwardly into and within the sides of the top casing handle 2 and is pivotally connected thereto by means of a pin 4I which passes through apertures 42 in the sides of the top casing handle 2 and apertures 43 in the upper offset portion of the legs of link 39. The link 39 is positioned approximately midway between the ends of the staple driving arm 23 and top casing handle 2. A coiled compression spring 44, riding on a centering pin 45 placed in the staple driving arm 23, and centered by an abutment 46 positioned within the handle 2, resiliently urges the handle 2 away from the body member I and thereby causes the staple driving arm 23 to be raised so that the bottom of the staple driver 22 is urged above the top of the staples positioned in the ejection chute and magazine. In order to limit the upward movement of the top casing handle 2 and staple driving arm 23 a, pin 41 is positioned in the top casing handle 2 near the forward end thereof in position to abut against the staple driving arm 23 as the staple driver 22 reaches its upper limit. The top edges of sides 5 are out away as at 41a to give the offset legs of link 39 clearance as the arm 23 is moved to its lowermostposition. v

The anvil supporting lever 3 is channel-shaped in cross section. The sides of the lever 3 are spaced apart to such a degree that the lever g. 3 fits between the side walls 5 of the body member I. The rear end of lever 3, as viewed in Figure 5, has oppositely alined apertures 48 in its side walls. A pin 49, held in apertures 50 positioned in the rear lower portion of side Walls 5, pivotally joins the anvil supporting lever 3 and vbody member I. At its forward portion the width of the lever 3 is enlarged to be substantially the same width as the main body member I. The enlarged forward portion is substantially co-extensive with the inturned supports 1 formed on the bottom of the body I. Substantially centrally of the length of lever 3, the sides are providedv with apertures 5I. Rearwardly of these apertures 5I the bottom portion of lever 3 is slotted as at 52. A connecting lever 53, having a downwardly projecting finger 54, is pivoted to the legs of sliding link I4 by a pin 55. The lever 53 is provided with apertures 56 intermediate its length and is pivotally connected to the lever 3 by pivot pin 51 which passes through the apertures 5I and 5B. Notches 56a are cut in the lower edge of sides 5 to permit the insertion of pin 51. The finger 54 protrudes through the slot 52 and bears against the bottom of lower casing handle 4. As pressure is applied to the finger 54 to move it upwardly toward the body member I, it will cause the anvil supporting lever 3 to swing in clockwise fashion about A coiled compression spring 58, held on a centering pin 59 secured to the bottom of lever 3 just adjacent slot 52 and the bottom of channel member 9 and centered by an abutment 60 positioned on the bottom of channel member 9, normally urges the lever 3 counterclockwise about pivot 49.

The lower casing handle It is of channel-shaped cross section, its bottom being arcuately curved to facilitate the grasping of the same in the 1ingers of the hand of the operator. The side walls 6I are suiiiciently spaced to receive therebetween the widened forward end of anvil supporting lever 3 and the sides 5 of body member I. The forward end of lower casing handle 4 is provided with forwardly extending tabs having oppositely alined apertures 62. The sides of anvil supporting lever 3 at its forward widened portion are provided with cppositely alined apertures 63. A pin 64, secured in apertures 62 and 63, pivotally holds the lower casing handle 4 to the anvil supporting lever 3. The bottom rear portion of side walls 5 of body member l are provided with rearward extensions which are engaged by a pin 66 extending between the side walls of the lower casing handle 4 at its rear end to limit its clockwise movement about pivot 64. This limits the counter-clockwise movement of the anvil supporting lever 3 about pivot 49 to a predetermined distance from the lower forward portion of body member 6. The space thus defined is adapted to receive the material into which staples are to be aixed.

The forward widened portion of anvil supporting lever 3 carries the staple clinching anvil members 57 and 38. The anvil members 61 and 68 are identical in construction with the exception that they are right and left-hand opposites. Each has a downwardly curved rear portion 69 having therein aperture 1b. The portion 69 is adapted to fit against the bottom of the forward end of anvil supporting lever 3 and to be secured thereto by rivet lila. Each of the anvil members 67 and 68 has a forwardly and downwardly curving portion Il, the lower part of which bears against the top forward edge of the bottom of anvil supporting lever 3. The main or middle bridge portion i2 of each anvil member 61 and 68 has an extension which extends to one side in the case of member 6l and to the opposite side in the case of member 68. The top of the bridge portions 12 are provided with two sets of clinching cavities, one an elongated cavity 13, the other a shorter cavity-'HL The elongated cavity 13 slopes downwardly and outwardly from the central portion of the bridge to the non-extension side of each member. The short cavity 14 slopes downwardly andr outwardly from a point closely adjacent the inner end of cavity 'I3 to the extension side of bridge portion 12. Laterally flared flanges 'i5 are formed on the sides of the anvil supporting lever 3 at its widened forward end. The rivets 10 are secured in apertures 1B provided in the forward portion of the bottom of anvil supporting lever 3 and are positioned with such relation to the flanges 'i5 that the bottom of the extensions of the bridge portions 'i2 ride on the flanges 15. A spring 19 having wing members is tted between the anvil members 61 and 68 and the bottom of anvil supporting lever 3. The purpose of spring 19 is to maintain each of the anvil members 61 and E8 under sufficient tension to maintain them in selected positions. As shown in Figures 3 and 4, the anvil members 31 and 68 maybe pivoted about the rivets Il until they are in inward side engaging contact (see Figure 3). In such position the inner ends of the shorter cavities I4 are directly in alinement'with the legs of staplesas they are forced out of the ejection chute. The outward and downward slope of the cavities 14 cause the legs of the staples to be bent outwardly and clinched against the bottom of the material stapled. This forms what is termed a temporary or pin stitch. The anvil members 61 and 38 may be pivoted about the rivets 'H until each engages with the respective side of anvil supporting lever 3, as illustrated in Figure 4. In this position, the internal ends of the larger cavities 'i3 are directly beneath the legs of staples being ejected from the ejection chute. The slope of the cavities 13 bend the legs of the staple inwardly beneath its bridge portion forming what is termed a permanent stitch. In some instances it may be desired to have a combination of a permanent and a temporary stitch. In such event it is only necessary to have one of the anvil members moved outwardly until it abutsv the side of lever 3 and the other moved to or left in the inward position. So positioned, one leg of the staple will be bent outwardly and the other leg of the staple will be clinched inwardly under the bridge. In order to move the anvil members 6I and t3 about their Y pivot points, the face of the forward ends may be provided with grooves id which may be readily engaged by the linger-nail of the operator, or by other means. The anvil members herein designated are also described and claimed in copending application of William G. Pankonin, Serial No. 388,011, filed April ll, i941, for Stapling machine anvil.

In the operation of the device, it is some times essential to manipulate the staple driving mechanism without operation of the staple clinching anvil. To this end there is provided a stop in the form of a spring latch 83 secured to the inner side of the wall oi the lower casing handle 4 in an outwardly offset embossment 3 l. The embossment is provided at the forward end with a cutout 32 through which a button projection S3 on the spring latch 3S projects. The spring latch 83 is riveted so as to be normally held within the embossment with the button projection 3 extending through the cut-out When'the device is held in the hand of the operator,l the thumb may be utilized to press the button'projection AB3 inwardly to the position shown in Fig. 9 whereupon the inner end of the button projection 83 will engage with the lower edge ofthe side 5 of the body member i, thereby locking the lower casing handle and anvil supporting lever 3 against any movement with respect to the body member i. Thereupon the parts may be moved to the position shown in Figure 8. A staple-driving action will take place as hereinafter described without the clinching action, thus expelling clogged staples.

In order to enhance the appearance ofthe machine there is provided a false bottom 34, which frictionally fits within the forward widened end of the anvil supporting lever 3 rearward of the anvil members 6l and 53. An angle member 85 is secured to the inturned supports 1 at their rear ends and projects downwardly to it within the anvil supporting member 3 just rearwardly of the false bottom 34.

To operate the device, it is grasped in the hand of the operator with the lingers encircling the lower casing handle d and the thumb and palm encircling the top casing handle 2. When so held, gripping pressure of the hand will urge each of these handles toward each other and toward the body member I. The springs 44 and 58 are so proportioned that as relative force is applied between the'top casing handle 2 and the lower casing handle 4, the lower casing handle will rst move in counter-clockwise fashion. This movement will apply force upon the nger 54, causing the lever 53 to rotate in clockwise fashion about the pivot point 55, thus drawing the anvil supporting lever 3 toward the bottom of the forward portion or body member I. The sliding link I4 will move forwardly along the slots I3 during this action. When parts have reached the position shown in Fig. 6 and when the anvil members 61 and 68 have engaged the bottom of the forward end of body I, or the material to be stapled has been fully compressed therebetween, a further gripping action will cause the top casing handle 2 to move in clockwise fashion about its pivot point 36. This will transmit a force to the stapling driving arm 23 through the link 39, causing the arm 23 to move in counter-clockwise fashion about its pivot 2B, forcing the driving blade 22 vertically downwardly through the ejection chute. The parts will then assume the position shown in Figure '7. When pressure is released, the parts will be urged by the action of springs 54 and 58 to assume again the position shown in Figure 2.

While constructions in which this invention may be embodied have been shown and described, it is to be understood that these constructions have been selected merely for the purpose of illustration or example and that various changes in size, shape, and arrangement oi parts may be made Without departing from the spirit of the invention or the scope of the subjoined claims.

The invention is:

1. In a stapling machine, a body member comprising a magazine and an ejection chute, a staple driving arm pivoted to and slidable within said body member, a top casing handle pivoted to and enclosing the top of said body member, linkage connecting said staple driving arm and said top casing handle, an anvil supporting lever pivoted to and slidable within said body member, a lower casing handle pivotally mounted on and fitting over said anvil supporting lever, and a connecting lever interconnecting said anvil supporting lever and said body member, and operable by said lower casing handle.

2. In a stapling machine, a body member comprising a magazine and an ejection chute, a staple driving arm pivoted to said body member, a top handle pivoted to said body member, linkage connecting said arm and said handle, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said lever, and a connecting lever interconnecting said supporting lever and body member, and operable by said lower handle.

3. In a stapling machine, a body member comprising a magazine and an ejection chute, a staple driving arm pivoted to said body member, a top handle pivoted to said body member, linkage connecting said arm and said handle, and anvil supporting means operable in connection with said top handle.

4. In a stapling machine, a body member comprising a magazine and an ejection chute, staple driving means including a top handle associated therewith, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said supporting lever, and a connecting lever interconnecting said anvil supporting lever and said body member, and operable by said lower handle.

5. In a stapling machine, a member comprising a magazine and an ejection chute, a plurality of arms pivoted to said member, said arms vbeing cooperably movable toward said member to drive staples from said magazine through said ejection chute and clinch the same, a handle pivoted to said member and connected to one of said arms, and another handle pivoted to the other of said arms and having force transmission association with said member.

6. In a stapling machine, a body member comprising a magazine and an ejection chute, staple driving means including a top handle associated therewith, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said supporting lever, and a lever slidably interconnected with said body member,

' pivoted to said anvil supporting lever and having a projecting portion engageable with said lower handle.

7. Inra stapling machine, a body member comprising a magazine and an ejection chute, a staple driving means including a top handle associated therewith, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said supporting lever, a slot in said anvil supporting lever, and a camming lever pivoted to said anvil supporting lever and having one end. interconnected with said body member and the other end extending through said slot and engageable with said lower handle.

8. In a stapling machine, an elongated body member comprising a magazine for staples and having at one end thereof an ejection chute, a staple driving blade reciprocal in said ejection chute, a staple driving arm connected to said blade and pivoted to the other end of said member, a handle pivoted to said member adjacent the ejection chute end, a link interconnecting said handle and said staple driving arm, spring means acting between said handle and said staple driving arm and positioned between said link and the pivotal interconnection between said staple driving arm and said member, means carried by said handle to limit the upward motion of said staple driving arm, and means associated with said body member and cooperable with said handle to clinch the legs of staples driven from said ejection chute.

9. In a stapling machine, an elongated body member comprising a magazine for staples and having at one end thereof an ejection chute, means for driving staples from said magazine out through said ejection chute including a top handle, an anvil supporting lever pivoted to the other end of said body member and having at its free end a staple clinching anvil in alinement with said ejection chute, a lower handle pivoted to said anvil supporting lever adjacent said anvil end thereof, a connecting lever pivotally connected to said body member and said anvil supporting member intermediate the ends thereof and having a portion engageable by said lower handle, a compression spring acting between said body member and said anvil supporting lever rearward of said connecting lever, and means carried by said lower handle limiting its movement away from said body member.

l0. In a stapling machine, an elongated body member comprising a magazine for staples and having at one end thereof an ejection chute, a staple driving blade reciprocal in said ejection chute, a staple driving arm connected to said blade and pivoted to the other end of said member, a handle pivoted to said member adjacent the .ejection chute end, a link interconnecting said handle and said staple driving arm, spring means acting between said handle and said staple driving arm and positioned between said link and the pivotal interconnection between said staple driving arm and said member, means carried by said handle to limit the upward motion of said staple driving arm, an anvil supporting lever pivoted to the other end of said body member and having at its free end a staple clinching anvil in alinement with said ejection chute, a lower handle pivoted to said anvil supporting lever ad- `iacent said anvil end thereof, a connecting lever pivotally connected to said body member and said anvil supporting member intermediate the ends thereof and having a portion engageable by said lower handle, a compression spring acting between said body member and said anvil supporting lever rearward of said connecting lever, and means carried by'said lower handle limiting its movement away from said body member.

11. In a stapling machine, a body member comprising a magazine and an ejection chute, a staple driving arm pivoted to said body member, a top handle pivoted to said body member, linkage connecting said arm and said handle, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said lever, a connecting lever interconnecting said supporting lever and body member, and operable by said lower handle, and a spring biased latching stop carried by said handle and adapted to be moved into position to engage said body member and restrain said handle from moving relatively theretoward.

12. In a stapling machine, a body member comprising a magazine and an ejection chute, a staple driving means including a top handle associated therewith, an anvil supporting lever pivoted to said body member, a lower handle pivotally mounted on said supporting lever, a connecting and staple clinching means including a lower enclosing handle, a body member including a magazine and ejection chute comprising an elongated channel member forming a track upon which the staples ride in straddle fashion, a metal member folded longitudinally about said channel from the forward end thereof, said member having a front wall spaced from the forward end of Said channel and side walls paralleling the sides of said channel, said side walls having inwardly projecting ridges formed therein and spaced from and above the top of the sides of said channel to guide staples riding thereon.

14. In a stapling machine having staple driving mechanism including a top enclosing handle and staple clinching means including a lower enclosing handle, a body member including a magazine and ejection chute comprising an elongated channel member forming a track upon which the staples ride in straddle fashion, a metal member folded longitudinally about said channel from the forward end thereof, said member having a front wall spaced from the forward end of said channel and side walls paralleling the sides of said channel, said side walls having inwardly projecting ridges formed therein and spaced from and above the top of the sides of said channel to guide staples riding thereon, said side walls at their forward ends having lower inturned supports connected to the bottom of said channel, said channel having integrally formed laterally projecting shouldered rivets engaged with said side walls.

15. In a stapling machine having a body member comprising a magazine and an ejection chute, and staple driving means including a top enclosing handle pivoted to said body member, means for pivotally interconnecting said top enclosing handle and said body member comprising a pivot pin having a centrally located encircling groove, a slot in the forward end of said top enclosing handle, and a pin locking spring held within said top enclosing handle at its forward end and having a portion movable in said slot, said portion being provided with a key engageable with said groove to releasably hold said pin in position.

WILLIAM Gr. PANKONIN. 

